Is there something wrong with me?

I have a problem. My Nephew just turned two,but I've loved him since before he was born. at first his mother and father (which are my brother and sister in law ) didn't want him when they found out that they where pregnant they where going to abort him,but i talked them out of it. i went to every doctors appointment ,and named the baby. then i raised him until just recently a couple of days before his 2nd birthday they took him away from me because they where upset they saw a photo of us and said that "we look too much like a family" now I'm devastated but i can't do anything about it because they're his parents.but they don't know any thing about the baby,his favorite lullaby,his favorite toys,his favorite story nothing! and i don't have kids of my own ,but how can i stop my heart from feeling this way I feel like he's my baby am i wrong to feel this way?